Tool for cutting key-seats in the hubs of wheels.



w. G. THUMM. TOOL FOR CUTTING KEY SEATS IN THE HUBS 0F WHEELS. I

APPLICATION FILED AUG. 1, 1912.

1,070,750. Patented Aug. 19, 1913.

.9 Z) :31} I 4 a I r Q :1 4/ 2 07 '1 I l 01 WW JZ WITNESSES AltomydUNITEI) STATES PATENT OFFICE.

WILLIAM G. THUMM, OF BALTIMORE, MARYLAND, ASSIGNOR 0F ONE-HALF TO LEWISM. KEIZER, BALTIMORE, MARYLAND.

Specification of Letters Patent.

Patented Aug. 19,1913.

Application filed August 1, 1912. Serial No. 712,695.

T 0 all whom it may concern:

Be it known that 1, WILLIAM G. T'IIUMM, of the city of Baltimore andState of Waryland, have invented an Improved Tool for Cutting KeySeatsin the Hubs of lVheels, of which the following is a specification.

In the description of the said invention which follows, reference ismade to the accompanying drawing, forming a part hereof, and in which:

Figure 1 is an exterior front view of the improved tool, and Fig. 2 asectional side view of the same. Fig. 3 is a section taken on the brokenline mm in Fig. 2, and Fig. 4: is a section taken on the broken line y-yin the same figure.

Referring now to the drawing, 1 is a cylindrical bar having a taperedend a adapted to enter and fit the socket of an ordinary drill press, orany similar appliance fitted to produce in the bar, an up-and-downmotion. The upper end of the cylindrical bar 1 is provided with adiametric slot 6, and its lower end has a similar slot 0 in which isfastened the block (Z; and extending between the slots Z) and 0, is achannel f of a width corresponding with that of the slots.

2 is a curved cutter pivoted at g in the slot 0, having at its free enda cutting tooth h which can be projected beyond, or drawn within thecircumference of the bar.

3 is a flat plate situated in the channel f, and adapted to slidelongitudinally 'of the same. The part is of the plate 3, projectslaterally beyond the remaining portion, and

' enters the upper slot 6, and the edges of the bar are threaded toreceive a circular nut 4 hereinafter more particularly referred to.

The lower end a of the flat plate 3 is curved as shown in Fig. 2, andbears against the curved surface of the cutter 2 which is normally heldwith its cutting tooth within the circumference of the cylindrical barby means of a spring m fastened to the block (Z, by the screws n.

7 is a collar on the cylindrical bar 1 the under face of which rests ona shoulder 0 (shown in dotted lines only in Fig. 4:)

formed by reducing the diameter of the bar, and 9 a second collarfastened to the cylindrical bar 1 by a pin 3?; and interposed betweenthese two collars is the circular nut at before referred to.

By reference to Fig. 2 it will be seen that the depth of the overhangingpart is of the flat plate 3 is less than that of the upper slot 6, andin consequence, the plate is susceptible of longitudinal adjustment inthe channel of the cylindrical bar 1 by turning the nut 4.

Supposing that a key-seat is to be cut in the hub of a wheel, a tool isselected having a diameter corresponding with that of the hole in thehub, and its tapered end inserted in a press socket which is directlyover the hub. The nut 4: is then turned so as to give such projection ofthe tooth it beyond the circumference of the bar, as is necessary toproduce the first cut, when the tool is forced downward through the huband a key-seat of a limited depth thereby produced. Upon the tool beingraised, the nut is again turned to increase the projection of thecutting tooth, and a second cut taken, and this operation is continueduntil the required depth of key-seat is obtained.

I claim as my invention:-

1. In a tool for the purpose described, a cylindrical bar having thereina longitudinally disposed groove terminating at one end in a transverseslot which extends diametrically across the bar, combined with aslidable plate which is situated in the said groove and is provided withan overhanging head which rests in the slot, and is threaded at itsedges, a nut for the threaded plate susceptible of a circumferentialmotion only, a cutter pivoted in the groove, and means operated by thelongitudinal movement of the slidable plate for operating the cutter.

2. In a tool for the purpose described a cylindrical bar having thereina longitudinally disposed groove terminating at its upper end in atransverse slot which extends diametrically across the bar, combinedwith a slidable plate situated within the groovev and provided at itsupper end With a threadl groove, and means operated by the longituedhead which is within and adapted to have diual n'iovement of theslidable plate for 0pon ll1JHil(1-(jl()Wl1 movement within the slot,erating the cutter.

and having at its lower end an inclined sur- VILLIAH G. TIIUh'lhI. face,a not on the threaded portion of the Vitnesses:

plate susceptible of a circumferential motion WM. T. HOWARD,

only, a spring-held cutter pivoted Within the JULIA B. ROBINSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

